feat(plating): Phase 1 — plant-view kanban data model foundation

PV-T1: fp.work.centre.area_kind Selection (9 floor columns)
PV-T2: fp.job.step.area_kind compute + _STEP_KIND_TO_AREA fallback
       (covers all 30+ step kinds in the project library, plus the
       spec D4 rule that de_mask folds into de_racking)
PV-T3: fp.job.step.last_activity_at + write hook + message_post
       override + fp.job.step.move.create() hook + _fp_is_idle helper
PV-T4: res.users.paired_work_centre_ids M2M (single-station for MVP,
       forward-compatible for Phase 2 multi-station picker)
PV-T5: res.config.settings.x_fc_shopfloor_layout feature flag backed
       by ir.config_parameter for the landing-action resolver

Migrations:
  fusion_plating 19.0.21.0.0      — backfill area_kind from kind
  fusion_plating_jobs 19.0.10.24.0 — backfill last_activity_at

Deployed + verified on entech:
  - 9/9 fp.work.centre rows have area_kind set
  - 400/400 fp.job.step rows have area_kind + last_activity_at
  - paired_work_centre_ids M2M relation table created
  - All 271 modules loaded cleanly, registry rebuilt in 27s

Part of the 2026-05-23 Shop Floor plant-view kanban redesign.
Plan: docs/superpowers/plans/2026-05-23-shopfloor-plant-view-plan.md
Spec: docs/superpowers/specs/2026-05-23-shopfloor-plant-view-design.md

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.20.10.0',
+    'version': '19.0.21.0.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """

fusion_plating/fusion_plating/migrations/19.0.21.0.0/post-migrate.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+# Copyright 2026 Nexa Systems Inc.
+# License OPL-1 (Odoo Proprietary License v1.0)
+#
+# 19.0.21.0.0 — Plant-view Shop Floor kanban redesign.
+# Backfill fp.work.centre.area_kind from the existing `kind` taxonomy so
+# every routing station has a defined Floor Column on day 1. Admins can
+# override afterwards via Configuration → Shop Setup → Routing Stations.
+
+import logging
+_logger = logging.getLogger(__name__)
+
+
+def migrate(cr, version):
+    """Backfill area_kind on existing fp.work.centre rows.
+
+    Mapping is intentionally permissive: every existing kind maps to a
+    sensible default. Unmapped (e.g. 'other') falls to 'plating' as the
+    safe wet-shop catch-all and is logged for review.
+    """
+    cr.execute("""
+        UPDATE fp_work_centre
+           SET area_kind = CASE kind
+               WHEN 'wet_line' THEN 'plating'
+               WHEN 'bake'     THEN 'baking'
+               WHEN 'mask'     THEN 'masking'
+               WHEN 'rack'     THEN 'racking'
+               WHEN 'inspect'  THEN 'inspection'
+               ELSE 'plating'
+           END
+         WHERE area_kind IS NULL
+    """)
+
+    # Log any rows that landed on the catch-all so the admin can review.
+    cr.execute("""
+        SELECT id, name, code, kind
+          FROM fp_work_centre
+         WHERE area_kind = 'plating'
+           AND kind = 'other'
+    """)
+    rows = cr.fetchall()
+    if rows:
+        _logger.warning(
+            "%d fp.work.centre rows had kind='other' and were defaulted "
+            "to area_kind='plating'; review and adjust if needed: %s",
+            len(rows),
+            ', '.join(
+                '%s (id=%s, code=%s)' % (r[1], r[0], r[2])
+                for r in rows[:10]
+            ),
+        )
+    _logger.info("Backfilled area_kind on fp.work.centre")

fusion_plating/fusion_plating/models/fp_job_step_move.py

@@ -77,6 +77,27 @@ class FpJobStepMove(models.Model):
         string='Transition Input Values',
     )
 
+    @api.model_create_multi
+    def create(self, vals_list):
+        """Stamp last_activity_at on from_step + to_step so the plant-view
+        idle gate (S16) sees moves as activity. Without this, a step that
+        only ever gets moves (no chatter, no state edits) eventually
+        trips the 8-hour idle warning falsely.
+        """
+        moves = super().create(vals_list)
+        Step = self.env['fp.job.step']
+        step_ids = set()
+        for m in moves:
+            if m.from_step_id:
+                step_ids.add(m.from_step_id.id)
+            if m.to_step_id:
+                step_ids.add(m.to_step_id.id)
+        if step_ids:
+            Step.browse(list(step_ids)).sudo().with_context(
+                tracking_disable=True,
+            ).write({'last_activity_at': fields.Datetime.now()})
+        return moves
+
     # ------------------------------------------------------------------
     # S23 — required transition-input gate
     # ------------------------------------------------------------------

fusion_plating/fusion_plating/models/fp_work_centre.py

@@ -48,6 +48,26 @@ class FpWorkCentre(models.Model):
         required=True,
         default='other',
     )
+    area_kind = fields.Selection(
+        [
+            ('receiving',  'Receiving'),
+            ('masking',    'Masking'),
+            ('blasting',   'Blasting'),
+            ('racking',    'Racking'),
+            ('plating',    'Plating'),
+            ('baking',     'Baking'),
+            ('de_racking', 'De-Racking'),
+            ('inspection', 'Final inspection'),
+            ('shipping',   'Shipping'),
+        ],
+        string='Floor Column',
+        help='Which Shop Floor column this work centre belongs to. '
+             'Drives the plant-view kanban grouping — any job whose '
+             'active step uses this work centre routes into this column. '
+             'See docs/superpowers/specs/2026-05-23-shopfloor-plant-view-'
+             'design.md §4.2 for the mapping rules.',
+        index=True,
+    )
     cost_per_hour = fields.Monetary(
         currency_field='currency_id',
         help='Used for fp.job.step cost rollups.',